And do secrete the recorder!
In UK your large-scale threat is from unsophisticated chavs, who are very alert to CCTV hence hoods and baseball caps, and they will steal any tapes they find n VCR's just in case they're security tapes. Your small-scale threat depends on your profile, or directed attack (in which case enlist neighbours for look-in coverage instead of look-out) or enlist help of professionals.
If analogue camera, then get hold of an old but competent VHS (ebay?) recorder, put it in the loft or wherever and set it up to roll-over record for slightly longer than you'll generally be away.
If you are away Mon - Fri, set it for seven-day recording, just leave it running and change tapes monthly (after four uses, because they do wear out).
If digital, an old PC for fifty quid will do just the same job but probably with higher storage capacity dependent upon HDD. Again, secrete it. MK