sigh. Even *more* useful would be to remember the right numbers (8193
not 8195), or how to get them:
% mke2fs /dev/null 1000000
(stuff elided)
Superblock backups stored on blocks:
8193, 16385, 24577, 32769, 40961, 49153, 57345, 65537, 73729,
81921, 90113, 98305, 106497, 114689, 122881, 131073, 139265, 147457,
that's for the defaults; if you run mke2fs with any other value, just
be sure to (1) remember what you gave it (2) write these numbers down...