Comment # 4 on bug 1188115 from Michael from Offenbach Germany

(In reply to Tejas Guruswamy from comment #3)
> The issue is most likely trying to take a backup of the currently open
> backup log.
> 
> Are you trying to take a whole-system backup of /?

THANKS for this hint, yes, I'm doing a full system backup except the usual tmp
etc. folders.

> 
> Please try again after limiting the backup to only required folders or add
> /root/.local/share/backintime/takesnapshot_.log to your exclude patterns.

Have added the whole /root/.local/share/backintime folder to my backintime's
exclude list. Haven't been in there before. Also checked with the latest
succesful snapshot (=latest 15.2 snapshot, done exactly before upgrading to
15.3), and some other, random older snapshors: this folder
/root/.local/share/backintime didn't exist in any snapshot.

So the usage of this folder must be be newly introduced for backintime 1.12, or
specficly configured for 15.3, don't know.

Unfortunately, but probably by design because of the changed exclude list,
backintime now performs a real "full" backups. So NO hard links as usual, but
"full" copies. Waste of disk space, but fine if just once, will see and comment
here