A good reference for provenance research using library stamps can be found in Provenance research in book history: a handbook, by D Pearson (London, 1994. repr. 1998). [RAR090.16], with specific mention of BM and BL stamps.

A message from Edmund MB King (formerly worked at the BL 1975-2012): "For those who want to know more about the identification of printed books, using their stamps, in the early years of the British Museum, the detailed article by P.R. Harris entitled: "Identification of printed books acquired by the British Museum, 1753-1836, is Appendix I of 'Libraries within the Library; the origin of the British Library's Printed Collections', London: British Library, 2009, pp. 387-428."

Hello Debi, All our digital assets are backed up on servers in various locations and are routinely monitored for file integrity. Our Digital Preservation Strategy lists Strategic Priority 1: Ensure our digital repository can store and preserve our collections for the long term, so backups are very important to us http://www.bl.uk/aboutus/stratpolprog/collectioncare/discovermore/digitalpreservation/strategy/BL_DigitalPreservationStrategy_2013-16-external.pdf Regarding standards and migration you can read a useful overview of the Digital Preservation team's approach at http://www.alliancepermanentaccess.org/wp-content/uploads/downloads/2013/03/APARSEN-REP-D23_1-01-1_0.pdf