I use an electronic logbook
If your good with computers, back up your logbook on cds, thumbdrive, or second hardrive, and also print out copies, electronic logbooks are great.
I use Logbook Pro, still arguably the best...took about 4 months to put 8 logbooks and 10k into it, by the pool, in hotels, at home..
No more math problems, n numbers pop up autmaticaly, printouts are nice clean and clear.
Being a corp pilot I don't know what the airlines say is ok or not but this is the best. Haven't used a paper logbook in about 4 years, all electonic.