Upgraded to 1.0pre? but when booting into backupmenu it still says 0.65. And I can't find some entry regarding format optfs.

Just tried to format optfs the manual way and this is what happened:
After doing a final backup (desktop running and backing up all data from mydocs via usb) I booted into backupmenu and first made a new backup of rootfs and optfs. Then switched to mass storage mode (rw), first copied the backup files to pc then unmounted all partitions and formatted second partition (i.e. optfs) with command
(the option -m 1 just declares to have only 1% of size as spare blocks for superuser instead of 5%) Afterwards I checked partition from pc with fsck and then just plugged usb cable out of device. Disabling mass storage mode by entering it's letter again didn't work, so I switched to mass storage (ro). Then I chose to restore a backup, chose appropriate files to restore and backupmenu quit with message "unable to mount optfs" and the hint to do a filesystem check. I did so, no errors appeared and in second try the restore now seems to work. Still restoring.....

EDIT
OK, restore is finished, I checked filesystems once again, rebootet into backupmenu again, made a new backup, checked filesystems again and then booted into desktop. all seems to work fine even if the problems why I did all this still exist. At least nothing broke and I can keep using my N900 as before.