borgbackup :文件更新时标记为A或U

Question

我想用borgbackup备份/var/lib/libvirt/backups/onlyoffice文件夹，它有一些xml文件和一些快照(.bimg)，以及qcow2镜像。

图像重14 GB。

root@kvm610:~ # ls -lh /var/lib/libvirt/backups/onlyoffice/onlyoffice.qcow2
-rwxr-xr-x 1 libvirt-qemu kvm 14G avril 12 07:17 /var/lib/libvirt/backups/onlyoffice/onlyoffice.qcow2*

第一个borgbackup备份持续2m37，所有文件都被标记为A，因为“已添加”。

root@kvm610:~ # time borg create --list /var/lib/libvirt/borgbackup/kvm610::trial4 /var/lib/libvirt/backups/onlyoffice
A /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-28_06:25:22.xml
A /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-23_06:25:35.xml
A /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-09-02_06:25:03.xml
A /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-26_06:25:35.xml
A /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-29_06:25:14.xml
A /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-30_06:25:17.xml
A /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-31_06:25:26.xml
A /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-09-01_06:25:10.xml
A /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-22_06:25:08.xml
A /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-24_06:25:51.xml
A /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-25_06:25:23.xml
A /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-27_06:25:14.xml
A /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-141702
A /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-131701
A /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-121701
A /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-111701
A /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-101701
A /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-091701
A /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-081701
A /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-071702
A /var/lib/libvirt/backups/onlyoffice/onlyoffice.qcow2
d /var/lib/libvirt/backups/onlyoffice

real    2m37,093s
user    1m46,503s
sys    0m11,726s

然后，我在相同的仓库中使用不同的归档名称(trial5)重新启动相同的备份。所有的xml和bimg文件都被标记为U，就像“未改变”一样，但是qcow2图像仍然被标记为A，即使它没有移动...该虚拟机自4月以来一直处于关闭状态。

root@kvm610:~ # time borg create --list /var/lib/libvirt/borgbackup/kvm610::trial5 /var/lib/libvirt/backups/onlyoffice
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-28_06:25:22.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-23_06:25:35.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-09-02_06:25:03.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-26_06:25:35.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-29_06:25:14.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-30_06:25:17.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-31_06:25:26.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-09-01_06:25:10.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-22_06:25:08.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-24_06:25:51.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-25_06:25:23.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-27_06:25:14.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-141702
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-131701
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-121701
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-111701
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-101701
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-091701
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-081701
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-071702
A /var/lib/libvirt/backups/onlyoffice/onlyoffice.qcow2
d /var/lib/libvirt/backups/onlyoffice

real    2m36,473s
user    1m45,359s
sys    0m11,831s 

你有办法解释这件事吗？

备份时间也是一样的…2m37 / 2m36

提前谢谢你，

Answer 1

根据Thorsten Schöning，他在list borgbackup@python.org上回答了我的问题，答案包含在borgbackup文档中。

请参阅I am seeing ‘A’ (added) status for an unchanged file

文件缓存用于确定Borg是否已经“知道”/已经备份了一个文件，如果是，则从分块中跳过该文件。它会有意排除时间戳与创建的存档中的最新时间戳相同的文件。..。如果您希望避免不必要的分块，只需在备份源文件集中创建或触摸一个小文件或空文件(以便其中一个文件具有最新的时间戳，而不是您的50 do磁盘映像)，如果您要创建快照，请在此之后执行快照。

所以我决定在var/lib/libvirt/backups/onlyoffice文件夹中添加一个新的a文件: passwd。第一次备份(使用passwd)所需的时间与前一次相同: 2m35

root@kvm610:/var/lib/libvirt/backups/onlyoffice # time borg create --list /var/lib/libvirt/borgbackup/kvm610::essai6 /var/lib/libvirt/backups/onlyoffice
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-28_06:25:22.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-23_06:25:35.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-09-02_06:25:03.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-26_06:25:35.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-29_06:25:14.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-30_06:25:17.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-31_06:25:26.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-09-01_06:25:10.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-22_06:25:08.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-24_06:25:51.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-25_06:25:23.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-27_06:25:14.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-141702
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-131701
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-121701
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-111701
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-101701
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-091701
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-081701
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-071702
A /var/lib/libvirt/backups/onlyoffice/onlyoffice.qcow2
A /var/lib/libvirt/backups/onlyoffice/passwd
d /var/lib/libvirt/backups/onlyoffice

real    2m34,957s
user    1m44,797s
sys    0m12,468s

但是下一个备份是立即的: 0m07 !！

root@kvm610:/var/lib/libvirt/backups/onlyoffice # time borg create --list /var/lib/libvirt/borgbackup/kvm610::essai7 /var/lib/libvirt/backups/onlyoffice
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-28_06:25:22.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-23_06:25:35.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-09-02_06:25:03.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-26_06:25:35.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-29_06:25:14.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-30_06:25:17.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-31_06:25:26.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-09-01_06:25:10.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-22_06:25:08.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-24_06:25:51.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-25_06:25:23.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice_2021-08-27_06:25:14.xml
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-141702
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-131701
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-121701
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-111701
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-101701
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-091701
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-081701
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.bimg-20210412-071702
U /var/lib/libvirt/backups/onlyoffice/onlyoffice.qcow2
A /var/lib/libvirt/backups/onlyoffice/passwd
d /var/lib/libvirt/backups/onlyoffice

real    0m0,682s
user    0m0,454s
sys    0m0,146s

并且qcow2文件被标记为"U"，不出所料！

非常感谢Thorsten Schöning。

欧内斯特·恰雷洛。