Safedepositary is a relatively old timer in the HYIP world now. It has been around for over 4 months since early June 2011. That is a quite accomplishment for any HYIP that can survive this long.
The longevity of a HYIP is a necessity when dealing with a HYIP program. The rate of return also plays a factor in determine of the survival of any HYIP program.

Safedepositary also accepts a variety of e-currency payment processors: Liberty Reserve, Perfect Money, Alert Pay, Solid Trust Pay, and Bank Wire.

It has 4 types of funds you can invest with:
Virtax Fund, Rovasion Fund, Orston Fund, and Grand Fund.

Virtax Fund Details
Daily interest rate: 1.6%
Min deposit: $10
Investment period: 150 days (Mon-Fri)
Principal returned: Yes (after 150 days)
Premature closing fee: 30%
Compounding: Available
Signed paper contract: Available

Rovasion Fund Details
Daily interest rate: 1.8%
Min deposit: $1000
Investment period: 150 days (Mon-Fri)
Principal returned: Yes (after 150 days)
Premature closing fee: 30%
Compounding: Available
Signed paper contract: Available

Orston Fund Details
Daily interest rate: 2%
Min deposit: $5000
Investment period: 150 days (Mon-Fri)
Principal returned: Yes (after 150 days)
Premature closing fee: 30%
Compounding: Available
Signed paper contract: Available

Grand Fund Details
Daily interest rate: 2.3%
Min deposit: $40000
Investment period: 150 days (Mon-Fri)
Principal returned: Yes (after 150 days)
Premature closing fee: 30%
Compounding: Available
Signed paper contract: Available

The website looks quite unique as compared to other regular HYIPs. Based on the recent payment histories, unique site, over 4 months, and decent rate of return. It can be worthy of a try. I would only try with Virtax Fund based on less deposit requirements. Diversification is also important in HYIPs.

Investing in HYIP is highly risky. There is no guarantee success in these kind of programs. Do your own diligence first before investing.