What's the best way to slurp up DEC RX50s?

Backup implies an ability to restore, and, at least for me, TELEDISK has problems doing that. On my system (which at the time was a K6 233MHz machine) 3.5" disks could be restored without issue but 5.25" disks could not be reliably restored (this seemed to apply to both 360KB and 1.2MB disks). I assume that restoring RX50s will be no easier. It might just have been my system, it might just have been my copy of TELEDISK (there seem to be multiple copies floating around) but it did not fill me with confidence. Is the TELEDISK format freely available? If not, restoring your disks may be difficult once the last PC has expired! BACKUP/PHYSICAL has the advantage that you can at least work out where each block ends up (since the BACKUP source listings are available). (If anyone has suggestions for "imaging" 360KB floppies, 1.2MB floppies and RX50s using PC hardware running Windows or Linux or NetBSD, I'm all ears. Preference given to those with practical experience of restoring the data afterwards ... I'm not keen to run through several hundred floppies just on the off-chance it will be worthwhile.) Antonio