Thanks for the info Peter, i think i ran into the same isssue some time ago and could not find out why the backup stopped and also got deleted by solr.
I decided to stop current running updates to solr while backup is running and wrote an own backuphandler that simply just copies the index-files to some location and rotates older unneeded backups. I thought about a cleaner solution where the backuphandler should create a LOCK to the index which would prevent incomming updates to write into the index. (the same is happening when index-optimizing is running). Then when the LOCK is set, a backup could run without any problems and removes the LOCK when done then. I was not able to create a working LOCK that prevents incomming updates to be applied, never found out... -- Alexander Rothenberg Fotofinder GmbH USt-IdNr. DE812854514 Software Entwicklung Web: http://www.fotofinder.net/ Potsdamer Str. 96 Tel: +49 30 25792890 10785 Berlin Fax: +49 30 257928999 Geschäftsführer: Ali Paczensky Amtsgericht: Berlin Charlottenburg (HRB 73099) Sitz: Berlin