[Owncloud] OC-Update deletes my Backup!

[Niko]

Hi List,

I want to describe a "strange behaviour" in the Updater-Process.

1) I made a backup (Zip-File in OC-root-Folder) on the Server and
exported my SQL-DB.
2) I started with Version OC 5.0.5 and activated the "Updater"-App (Plugin)
3) Hit update-Button and waited a long time. Except "Update wird
gestartet" / "in Bearbeitung" nothing shows up (The Statusbar was stuck
in about the half of the Process).
4) After a few Minutes I hit the reload-Button in my Firefox and got a
Error 500.
I remember myself, that a lot of Options in the .htaccess-File leads my
server to this Error 500. After cleaning all the Options (except
Rewrite-Rules) from .htaccess-File OC loads normal again and finishes
the Update-Process normally.

I checked the Files via FTP and found out, that my Backup-Zip I made in
step 1 WAS DELETED!!! This is not funny! Why did the Updater deleted my
Backup-File?!

Hopefully you understood what I mean.
Best regards
Niko