Hi,
I ended up using https://github.com/alexjurkiewicz/acts/ with the
following config:
dailybackups=30
monthlybackups=6
yearlybackups=3
I think it's reasonable because tarsnap is not expensive and now I have
a fixed number of archives.
Thank you for all your valuable inputs.
Regards
Romu
On 2021/6/28 9:38, Michael Sierchio wrote:
I used to adhere to the following discipline. I don't know if this is
useful to you.
Run tarsnap daily. Each archive created is tagged as one of the
following:
daily-<filesystem>-YYYYMMDDTHHMMSSZ
weekly-<filesystem>-YYYYMMDDTHHMMSSZ
monthly-<filesystem>-YYYYMMDDTHHMMSSZ
is it the last day of the month? [ "`date -v+1d +%d`" = "1"]
create monthly archive
delete all but the N most recent monthly archives
else is it the last day of the week? [ "`date -v+1d +%u`" = "1"]
create weekly archive
delete all but the M most recent weekly archives
else
create daily archive
delete all but the J most recent daily archives
weekly are taken the last day of the week (Sat or Sun, dep. on your
locale) – monthly are taken on the last day of every month
On Sun, Jun 27, 2021 at 2:12 PM james young <[email protected]
<mailto:[email protected]>> wrote:
I could be off-base, but I think keeping a lot of extra archives
around leads to slower archive listing, fsck / cache directory
resyncing and reconstruction, and restores?
Mac Time Machine backup defaults: 24 hourly, 30 daily, then as
many weekly backups as space allows.
My config for tarsnap-cron: 7 daily backups, 5 weekly, 12 monthly.
It's my personal opinion, but a month is a nice buffer. Three days
is shorter than some holiday weekends, not to mention vacations.
In your place, I'd think about switching to one of the helper
scripts mentioned in another reply. See if it can work with the
archive names as they are now. You can copy archives if you want
to fit a new archive naming scheme (
https://www.tarsnap.com/tips.html#copy-archive
<https://www.tarsnap.com/tips.html#copy-archive> ). Or, if you're
sure you want to stick to the last three days/one month/whatever
and YOLO, wait that long, verify the backups, then delete archives
from the old method (
https://www.tarsnap.com/improve-speed.html#faster-delete
<https://www.tarsnap.com/improve-speed.html#faster-delete> ).
-James
Sent from my iPad
On Jun 26, 2021, at 3:26 PM, Romo Hu <[email protected]
<mailto:[email protected]>> wrote:
Hi,
My system has a daily cron job that does tarsnap backup which has
been running since 2017, and "tarsnap --list-archives" shows a
lot of archives. Should I care? Is it ok to just let the
archive number keep growing? If there will never be a need to
restore data that are more than 3 days old, can I just remove all
archives that are more than 3 days old? Is it possible to
configure tarsnap to only keep archives of the recent 3 days?
Regards
Romu
--
"Well," Brahmā said, "even after ten thousand explanations, a fool is
no wiser, but an intelligent person requires only two thousand five
hundred."
- The Mahābhārata
